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Rifles, Reloading, Optics, Equipment
Gunsmithing
Neck clearence on a Match Reamer
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<blockquote data-quote="J E Custom" data-source="post: 1328225" data-attributes="member: 2736"><p>Not to start an argument. But this has been a misconception for many years and the only time less clearance than .003 should be used is if the neck is turned for a perfect chamber fit and loaded without any sizing. (This used to be common practice for bench rest shooters) all loads were less than maximum so pressure was not an issue.</p><p></p><p>Using the neck to align a cartridge in a magnum cartridge is dangerous</p><p>without reducing the powder charge, and also unless the neck is the same size as the chamber, alignment does not exist because it ether fits or it doesn't. proper sizing of the case body and the shoulder will align the cartridge and no mater how much clearance the neck has, it will be aligned.</p><p></p><p>A well known gunsmith on this site discovered the problems with to little neck clearance in his pursuit for accuracy and velocity, and had to go back and increase this clearance on many of his rifles because of excessive pressure.</p><p></p><p>There is no way that anyone can guaranty that a non turned neck will have perfect clearance all the way around if the neck has been chambered .001 to .002 thousandths larger than a loaded round.</p><p>Most unturned brass cases have .001 to .003 thousandth differences in thickness from one side to another, hence the reason that .003 to .004</p><p>thousandths should be the minimum clearance. .004 thousandths larger neck chamber stills only gives you .002 thousandths per side. so</p><p>I will always recommend .004 thousandths larger than the loaded round</p><p>to stay out of trouble.</p><p></p><p>There used to be many things that were normal when pressures were less than 55,000 PSI but with pressures reaching 70,000 psi and in some cartridges more the rules have changed and need to be addressed.</p><p></p><p>PS: on dangerous game rifles more clearance is needed to assure that the second round will chamber even in a dirty or fouled chamber so you don't end up that green stuff between the elephants toes. the best group I have ever shot was .034 thousandths with a 416 and a 400 grain bullet with a total neck clearance of .008 ( .004 thousandths per side)</p><p></p><p>Just my opinion and experience</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1328225, member: 2736"] Not to start an argument. But this has been a misconception for many years and the only time less clearance than .003 should be used is if the neck is turned for a perfect chamber fit and loaded without any sizing. (This used to be common practice for bench rest shooters) all loads were less than maximum so pressure was not an issue. Using the neck to align a cartridge in a magnum cartridge is dangerous without reducing the powder charge, and also unless the neck is the same size as the chamber, alignment does not exist because it ether fits or it doesn't. proper sizing of the case body and the shoulder will align the cartridge and no mater how much clearance the neck has, it will be aligned. A well known gunsmith on this site discovered the problems with to little neck clearance in his pursuit for accuracy and velocity, and had to go back and increase this clearance on many of his rifles because of excessive pressure. There is no way that anyone can guaranty that a non turned neck will have perfect clearance all the way around if the neck has been chambered .001 to .002 thousandths larger than a loaded round. Most unturned brass cases have .001 to .003 thousandth differences in thickness from one side to another, hence the reason that .003 to .004 thousandths should be the minimum clearance. .004 thousandths larger neck chamber stills only gives you .002 thousandths per side. so I will always recommend .004 thousandths larger than the loaded round to stay out of trouble. There used to be many things that were normal when pressures were less than 55,000 PSI but with pressures reaching 70,000 psi and in some cartridges more the rules have changed and need to be addressed. PS: on dangerous game rifles more clearance is needed to assure that the second round will chamber even in a dirty or fouled chamber so you don't end up that green stuff between the elephants toes. the best group I have ever shot was .034 thousandths with a 416 and a 400 grain bullet with a total neck clearance of .008 ( .004 thousandths per side) Just my opinion and experience J E CUSTOM [/QUOTE]
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Neck clearence on a Match Reamer
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